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Imaging lens

  • US 10,564,394 B2
  • Filed: 11/02/2017
  • Issued: 02/18/2020
  • Est. Priority Date: 11/02/2016
  • Status: Active Grant
First Claim
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1. An imaging lens forming an image of an object on a solid-state image sensor, comprising in order from an object side to an image side,a first lens having negative refractive power,a second lens having positive refractive power and a biconvex shape,a third lens,a fourth lens having positive refractive power,a fifth lens having negative refractive power and is a double-sided aspheric lens, anda sixth lens that is a double-sided aspheric lens,wherein the first lens has a concave surface facing the image side near an optical axis, and the sixth lens has a concave surface facing the image side near the optical axis and at least one pole point at an off-axial point on an image-side surface, andbelow conditional expressions (1), (5), and (9) are satisfied:


  • ω



    45°





    (1)


    2.5<

    f1/f<



    1.0 



    (5)


    6.0<

    f5/f<



    1.5 



    (9)whereω

    ;

    a half field of view,f1;

    a focal length of the first lens,f5;

    a focal length of the fifth lens, andf;

    a focal length of the overall optical system.

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